阅读说明：本技术 一种缝纫机的防起针不上线装置 (Sewing machine prevents that needle-lifting does not go up traditional thread binding putting ) 是由 毕兴国 于 2020-12-21 设计创作，主要内容包括：本发明提供了一种缝纫机的防起针不上线装置,属于缝纫机技术领域。它解决了现有缝纫机起缝时容易出现起针不上线现象等技术问题。缝纫机包括旋梭和定位勾,本防起针不上线装置包括真空发生器和连接在真空发生器上的吸气管,吸气管的吸气端朝向所述旋梭处。本发明中通过真空发生器的吸附作用,在底线线头附近形成一定的真空负气压,使底线线头回到能正常起针的位置,从而可极大的改善缝纫机起针不上线的问题。(The invention provides a device for preventing a needle from lifting and not threading for a sewing machine, and belongs to the technical field of sewing machines. The sewing machine solves the technical problems that the needle lifting and the non-thread phenomenon are easy to occur when the existing sewing machine starts sewing. The sewing machine comprises a rotating shuttle and a positioning hook, the device for preventing the needle from being pulled up and the thread from being pulled up comprises a vacuum generator and an air suction pipe connected to the vacuum generator, and the air suction end of the air suction pipe faces to the rotating shuttle. According to the invention, a certain vacuum negative pressure is formed near the bottom thread end through the adsorption effect of the vacuum generator, so that the bottom thread end returns to the position where the needle can be normally lifted, and the problem that the needle of the sewing machine cannot be lifted is greatly improved.)

1. The utility model provides a sewing machine's needle-lifting prevention device of not going up line, sewing machine include rotating shuttle (1) and location collude (2), its characterized in that, this needle-lifting prevention device of not going up line includes vacuum generator (3) and suction pipe (4) of connection on vacuum generator (3), the end of breathing in of suction pipe (4) is towards rotating shuttle (1) department.

2. The needle-lifting off-line prevention device of a sewing machine according to claim 1, wherein the vacuum generator (3) has an air inlet (31), an air outlet (32) and a first air inlet (33), one end of the air suction pipe (4) is connected to the first air inlet (33) of the vacuum generator (3), the other end of the air suction pipe (4) is an air suction end and the end has a second air inlet (41).

3. The needle-lift off prevention device of a sewing machine according to claim 2, wherein the air inlet (31) is located at one end of the vacuum generator (3), the air outlet (32) and the first air inlet (33) are located at the same side of the vacuum generator (3), the first air inlet (33) is located between the air inlet (31) and the air outlet (32), and the air outlet (32) is provided with a noise reduction structure.

4. The needle lifting and thread non-threading prevention device of the sewing machine according to claim 2 or 3, characterized in that the sewing machine further comprises a mounting seat (5), the positioning hook (2) is fixedly mounted on the mounting seat (5), the positioning hook (2) is arranged at one end of the rotating shuttle (1) with a gap therebetween, and the air suction port II (41) of the air suction pipe (4) is fixed at an upper position between the rotating shuttle (1) and the positioning hook (2).

5. The needle lifting and thread non-threading prevention device of the sewing machine according to claim 4, wherein the mounting seat (5) is located at one side of the rotating shuttle (1), the positioning hook (2) is in a strip shape, one end of the positioning hook (2) is fixedly connected with the mounting seat (5) through a fixing screw (6), the other end of the positioning hook (2) extends towards the end of the rotating shuttle (1), the positioning hook (2) is located at the upper side of the end of the rotating shuttle (1), and the vertical distance from the air suction port II (41) of the air suction pipe (4) to the rotating shuttle (1) is 0.5 cm-3 cm.

Technical Field

The invention belongs to the technical field of sewing machines, and relates to a needle lifting and thread non-feeding prevention device of a sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. The rotating shuttle mechanism is one of core parts of the sewing machine, the formation of a bottom thread and an upper thread in a lock type stitch is finally realized through the thread hooking relation of the rotating shuttle and a machine needle, the bottom thread is simultaneously cut off by the thread cutting mechanism after the last sewing is finished, when the bottom thread is cut off, a thread end is usually positioned at the intersection matching part of the rotating shuttle and the positioning hook, the thread hooking is needed when the sewing machine starts sewing again, and due to the influence of some factors, for example, the thread end of the bottom thread is adhered to a bobbin case or is carried by other peripheral parts, the phenomenon that the front needles of the sewing machine cannot carry the bottom thread to form the stitch after the sewing machine starts sewing can be caused, and therefore the phenomenon of needle skipping is caused.

Chinese patent (publication No. CN 202380245U; publication No. 2012-08-15) discloses a pneumatic thread blowing device of a sewing machine, the sewing machine comprises a machine head and a machine base, the machine head is provided with a needle head and a presser foot capable of moving up and down, the pneumatic thread blowing device comprises: a drive mechanism for user control; the blowing unit can blow the cut thread end from the cloth and comprises a blowing port fixed relative to the presser foot, and the blowing port faces the needle head of the presser foot; the control unit controls the air blowing unit through the driving mechanism, the control unit comprises a touch switch matched with the driving mechanism, and the control unit is electrically connected with the air blowing unit; and the transmission mechanism is used for controlling the lifting of the presser foot through the driving mechanism, and is in transmission connection with the driving mechanism and the presser foot wire blowing device and comprises a driving mechanism, a blowing unit, a control unit and a transmission mechanism, the driving mechanism is connected with the control unit through a touch switch, the control unit is electrically connected with the blowing unit, and the transmission mechanism is in transmission connection with the driving mechanism and the presser foot.

The device for preventing the needle from lifting and not threading in the sewing machine in the patent document is realized by adopting a pneumatic thread blowing device, and after the sewing of the sewing machine is finished, a cut thread head is blown away from a rotating shuttle; but this pneumatic wire blowing device is last only to be provided with an gas blow pipe, blows the bottom line end of a thread to one side easily, is difficult to guarantee the accurate reliability of bottom line end of a thread position to still can appear the phenomenon that the needle rises and does not go up the line.

Disclosure of Invention

The invention provides a device for preventing a needle from lifting and not threading for a sewing machine according to the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to improve the accurate reliability of the end of a thread position of the bottom thread so as to effectively avoid the phenomenon that the needle is raised and the thread is not fed.

The purpose of the invention can be realized by the following technical scheme:

the device for preventing the needle from being lifted and the thread from being pulled on the sewing machine comprises a rotating shuttle and a positioning hook and is characterized by comprising a vacuum generator and an air suction pipe connected to the vacuum generator, wherein the air suction end of the air suction pipe faces to the rotating shuttle.

The working principle is as follows: through vacuum generator's adsorption among this technical scheme, form certain vacuum negative pressure near the bottom thread end of a thread, make the bottom thread end of a thread get back to the position that can normally rise the needle to can very big improvement sewing machine rise the needle problem of not going up the line. Particularly, after the thread is cut, the bottom thread is positioned at the matching position of the rotating shuttle and the positioning hook, and a certain length is reserved outside the rotating shuttle, so that the thread hooking and the thread feeding of subsequent sewing are facilitated. The bottom thread of the sewing machine can be brought to a position which is not beneficial to thread feeding by the thread cutting device after thread cutting, or the bottom thread can not be brought up by the surface thread because the bottom thread is adhered to other parts after being stained with engine oil. After the vacuum generator is ventilated, strong negative air pressure is formed near the air suction end of the air suction pipe to generate a vacuum effect, the bobbin thread head on the rotating shuttle is pulled into the air suction pipe, then the air source is cut off, and the bobbin thread is positioned at the position which can be smoothly taken by the upper thread after the auxiliary pulling of the vacuum generator.

The most important part in the technical scheme is a vacuum generator, and the product is a pneumatic standard product and is easy to obtain. The principle that the vacuum generator can generate strong suction is utilized, the bottom line end with uncertain position after line cutting is pulled to the position of successfully threading the line, and the whole device is simple, convenient to install and high in practicability.

In the device for preventing the needle from being lifted and the thread from being fed on the sewing machine, the vacuum generator is provided with the air inlet, the air outlet and the first air suction port, one end of the air suction pipe is connected to the first air suction port of the vacuum generator, and the other end of the air suction pipe is an air suction end which is provided with the second air suction port.

In the above-mentioned needle-lifting-prevention thread-feeding device of the sewing machine, the air inlet is located at one end of the vacuum generator, the first air exhaust port and the first air suction port are located at the same side of the vacuum generator, the first air suction port is located between the air inlet and the air exhaust port, and the air exhaust port is provided with a silencing structure.

In the device for preventing the needle from being lifted and the thread from being fed, the sewing machine further comprises a mounting seat, the positioning hook is fixedly mounted on the mounting seat, the positioning hook is arranged at one end of the rotating shuttle, a gap is formed between the positioning hook and the rotating shuttle, and the air suction port II of the air suction pipe is fixed at the upper position between the rotating shuttle and the positioning hook.

In the device for preventing the needle from being lifted and the thread from being fed, the mounting seat is positioned on one side of the rotating shuttle, the positioning hook is in a long strip shape, one end of the positioning hook is fixedly connected with the mounting seat through a fixing screw, the other end of the positioning hook extends towards the end part of the rotating shuttle, the positioning hook is positioned on the upper side of the end part of the rotating shuttle, and the vertical distance between the air suction port II of the air suction pipe and the rotating shuttle is 0.5 cm-3 cm. The vertical distance between the suction port of the air suction pipe and the rotating shuttle is preferably 1.5 cm. Thus, the mutual interference influence of parts is avoided, and the thread suction effect is ensured.

Compared with the prior art, a certain vacuum negative air pressure is formed near the bottom thread end through the adsorption effect of the vacuum generator, so that the bottom thread end returns to the position where the needle can be normally lifted, and the problem that the needle of the sewing machine cannot be lifted is greatly solved.

Drawings

FIG. 1 is a schematic view of the structure of the bottom line blowing device.

FIG. 2 is a schematic view of the installation structure of the rotating shuttle and the positioning hook in the background wire blowing device.

In the figure, 1, a rotating shuttle; 2. a positioning hook; 3. a vacuum generator; 31. an air inlet; 32. an exhaust port; 33. a first air suction port; 4. an air intake duct; 41. a second air suction port; 5. a mounting seat; 6. and fixing the screw.

Detailed Description

The following is a detailed description of the present invention and is further described with reference to the accompanying drawings, but the present invention is not limited to these examples.

As shown in figures 1 and 2, the sewing machine comprises a rotating shuttle 1 and a positioning hook 2, the device for preventing the needle from being pulled up and the thread from being pulled up comprises a vacuum generator 3 and an air suction pipe 4 connected to the vacuum generator 3, and the air suction end of the air suction pipe 4 faces to the rotating shuttle 1. Specifically, the vacuum generator 3 is provided with an air inlet 31, an air outlet 32 and a first air inlet 33, one end of the air suction pipe 4 is connected to the first air inlet 33 of the vacuum generator 3, the other end of the air suction pipe 4 is an air suction end, and the end is provided with a second air inlet 41; the air inlet 31 is positioned at one end of the vacuum generator 3, the air outlet 32 and the first air inlet 33 are positioned at the same side of the vacuum generator 3, the first air inlet 33 is positioned between the air inlet 31 and the air outlet 32, and the air outlet 32 is provided with a silencing structure.

As shown in fig. 2, the sewing machine further comprises a mounting base 5, the positioning hook 2 is fixedly mounted on the mounting base 5, the positioning hook 2 is arranged at one end of the rotating shuttle 1, a gap is formed between the positioning hook 2 and the rotating shuttle 1, and the air suction port two 41 of the air suction pipe 4 is fixed at the upper position between the rotating shuttle 1 and the positioning hook 2; the mounting seat 5 is located one side of rotating shuttle 1, the location colludes 2 and is rectangular form, and the location colludes 2 one end and links firmly mutually with the mounting seat 5 through set screw 6, and the other end that the location colluded 2 extends towards the tip of rotating shuttle 1, and the location colludes 2 and is located the tip upside position of rotating shuttle 1, and the perpendicular distance of two 41 induction ports distances rotating shuttle 1 of breathing pipe 4 is 0.5cm ~ 3 cm. The vertical distance between the second suction port 41 of the air suction pipe 4 and the rotating shuttle 1 is preferably 1.5 cm.

In the embodiment, a certain vacuum negative pressure is formed near the bottom thread end through the adsorption effect of the vacuum generator 3, so that the bottom thread end returns to the position where the needle can be normally lifted, and the problem that the needle of the sewing machine cannot be lifted is greatly solved. Particularly, after the thread is cut, the bottom thread is positioned at the matching position of the rotating shuttle 1 and the positioning hook 2, and a certain length is left outside the rotating shuttle 1, so that the thread hooking and the top thread of subsequent sewing are facilitated. The bottom thread of the sewing machine can be brought to a position which is not beneficial to thread feeding by the thread cutting device after thread cutting, or the bottom thread can not be brought up by the surface thread because the bottom thread is adhered to other parts after being stained with engine oil. After the vacuum generator 3 ventilates, form stronger negative pressure near the inspiratory end of breathing pipe 4, produce the vacuum effect, pull the bottom line end on the rotating shuttle 1 towards breathing pipe 4 in, the air supply cuts off afterwards, the bottom line is in the position that can smoothly be taken by the facial suture after the supplementary pulling of vacuum generator 3.

The most important component in this embodiment is the vacuum generator 3, which is a standard pneumatic product, readily available. The principle that the vacuum generator 3 can generate strong suction is utilized, the bottom line end with uncertain position after line cutting is pulled to the position where the line can be smoothly fed, and the whole device is simple, convenient to install and high in practicability.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although more 1, rotating shuttle is used herein; 2. a positioning hook; 3. a vacuum generator; 31. an air inlet; 32. an exhaust port; 33. a first air suction port; 4. an air intake duct; 41. a second air suction port; 5. a mounting seat; 6. fixing screws, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.